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首页> 外文期刊>Indian Journal of Weed Science >Effect of weed competition and level of nitrogen on performance of rice hybrids
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Effect of weed competition and level of nitrogen on performance of rice hybrids

机译：杂草竞争和氮素水平对杂交水稻性能的影响

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摘要

An experiment was conducted during dry season of 1994-95 and wet season of 1995 in clay loam soils. Recently released rice hybrids viz., DRRH-I and APRH-2 alongwith check variety Jaya were tested under three levels of N (0, 60 and 120 kg/ha) and three levels of weed competition viz., high weed competition (unweeded control), medium weed competition (two hand weedings at 20 and 45 days after transplanting-DAT) and weed free. Mean grain yield of hybrids and inbred variety Jaya was higher by 53.37 and 90.90 percent during dry and wet seasons, respectively, under weed free treatment over higher weed competition treatment. Hybrids responded differently to application of N levels and weed interference. DRRH-I recorded significantly higher mean grain yield of 4.42 and 3.91 t/ha over Jaya during dry and wet season, respectively. The maximum grain yield of 6.90 and 6.03 t/ha during dry and wet season, respectively, was obtained under high N level (N 120 kg/ha) in least weed competition with DRRH-1. Weed biomass was significantly higher under APHR-2 hybrid as compared to DRRH-1 during wet season. Based on these preliminary results, it can be inferred that rice hybrids should be selected based on their response to applied N level and their ability to tolerate weed competition.
机译：在1994-95年的旱季和1995年的雨季期间，在黏土壤土中进行了一项实验。在三个水平的N（0、60和120 kg / ha）和三个水平的杂草竞争水平，即高杂草竞争率（未除草对照）下测试了最近发布的水稻杂交种，即DRRH-1和APRH-2，以及检查品种Jaya。 ），中度杂草竞争（在DAT移植后20天和45天用两只手除草），然后除草。在较高的杂草竞争水平下，采用无杂草处理后，在干燥和潮湿季节，杂种和自交品种Jaya的平均谷物产量分别提高了53.37％和90.90％。杂种对氮水平和杂草干扰的反应不同。在干季和湿季，DRRH-1的平均谷物产量分别比贾亚州高出4.42吨/公顷和3.91吨/公顷。在高氮水平下（N 120 kg / ha），在与DRRH-1竞争最少的杂草中，分别获得了旱季和雨季的最高谷物产量6.90和6.03 t / ha。在雨季，APHR-2杂草的杂草生物量显着高于DRRH-1。根据这些初步结果，可以推断出应根据杂交水稻对氮素的反应及其对杂草竞争的耐受能力来选择杂交水稻。

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